Abstract
Nowadays, there is an increased demand in integrated sensors for electronic devices. Multi-functional sensors provide the same amount of data using fewer sensors. Carbon nanotubes are non-selectively sensitive to temperature, gas and strain. Thus, carbon nanotubes are perfect candidates to design multi-functional sensors. In our study, we are interested in a dual humidity-temperature sensor. Here, we present a novel method to differentiate at least two sources using the sensor’s frequency responses based on multiwall carbon nanotubes sensors. The experimental results demonstrate that there are temperature- or moisture-invariant frequencies of the impedance magnitude, and their values depend on the sensor’s geometry. The proposed measurement model shows that source-invariant frequencies of the phase can be also determined. In addition, the source separation method is generalized to other materials or sources enabling multi-functional sensors for environment monitoring.
Highlights
Carbon nanotube networks are non-selectively sensitive to gas [1,2,3], moisture [4,5,6,7,8,9,10], temperature [11,12], strain [13,14], and light intensity [15]
We will study the separation of two sources, namely temperature and moisture, using only one sensor based on multiwall carbon nanotube (MWCNT) networks in a polyimide matrix
°C to multiwalled carbon functionalized with carboxyl groups (MWCNTs) mixed in 140 °C by steps of nanotubes
Summary
Carbon nanotube networks are non-selectively sensitive to gas [1,2,3], moisture [4,5,6,7,8,9,10], temperature [11,12], strain [13,14], and light intensity [15]. The electrical behaviour of carbon nanotube networks fits with a parallel resistor–capacitor (RC) circuit [16]. In this case, two sources of perturbations A and B can be differentiated using the frequency response of the sensor if the resistance (R) is only sensitive to A, and the capacitance (C) to B and/or A. We will study the separation of two sources, namely temperature and moisture, using only one sensor based on multiwall carbon nanotube (MWCNT) networks in a polyimide matrix. There is another frequency where the impedance magnitude is moisture-invariant
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